Question

a 90.0 g sample of naoh is dissolved in water and the solution is diluted to give a final volume of 3.00 liters. the molarity of the final solution is ______.
0.500 m
0.750 m
1.00 m
2.25 m
none of the above

Explanation:

Step1: Calculate molar mass of NaOH

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Step2: Find moles of NaOH

Moles = $\frac{\text{mass}}{\text{molar mass}} = \frac{50.0}{40} = 1.25$ mol

Step3: Calculate molarity

Molarity = $\frac{\text{moles}}{\text{volume (L)}} = \frac{1.25}{3.00} \approx 0.417$ M

Step4: Compare with options

0.417 M is not in the given options.

Answer:

none of the above